1. Department of Neurosurgery, Gates Vascular Institute at Kaleida Health, Buffalo;
2. Departments of Neurosurgery and
3. Radiology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo;
4. Canon Stroke and Vascular Research Center, University at Buffalo, New York;
5. Department of Neurological Surgery, Thomas Jefferson University and Jefferson Hospital for Neuroscience, Philadelphia, Pennsylvania;
6. Department of Neurosurgery, Baylor College of Medicine, Houston, Texas; and
7. Department of Neurosurgery, University of Michigan, Ann Arbor, Michigan